WO2017004812A1

WO2017004812A1 - Link adaptation method for wlan, and network device

Info

Publication number: WO2017004812A1
Application number: PCT/CN2015/083592
Authority: WO
Inventors: 于健; 杨讯
Original assignee: 华为技术有限公司
Priority date: 2015-07-08
Filing date: 2015-07-08
Publication date: 2017-01-12
Also published as: CN107852769B; CN107852769A

Abstract

A link adaptation method for a WLAN and a network device, which can improve the flexibility of channel information measurement and provide accurate link adaptation to a user. The method in an embodiment of the present invention comprises: a first network device acquires a target channel information measurement result, the target channel information measurement result being a measurement result obtained by detecting channel information according to a physical protocol data unit (PPDU) in a target mode; and the first network device performs link adaptation adjustment according to the target channel information measurement result.

Description

WLAN link adaptation method and network device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a WLAN link adaptation method and a network device.

Background technique

In a wireless communication system, channel information of a wireless channel usually changes with time due to factors such as path loss, fading, or noise. Link adaptation techniques have been introduced for this time-varying nature of the channel. The link adaptation technology refers to the behavior of the system adaptively adjusting the transmission parameters of the system according to the currently acquired channel information, so as to overcome or adapt to the impact of the current channel change. It can be seen from the basic principles of the link adaptation technology that the link adaptation technology mainly includes two aspects: on the one hand, the acquisition of channel information, that is, how to accurately and effectively obtain the current channel condition; on the other hand, the transmission parameter Adjustments such as MCS (Modulation and Coding Scheme), transmit power, and time-frequency resources. At present, link adaptation technology has won the favor of its excellent performance in improving spectrum utilization and data transmission rate. It has been successfully applied in a variety of mobile communication systems and has become one of the key technologies to improve system performance.

In the link adaptation process of the existing WiFi (Wireless-Fidelity) standard, the mode of detecting PPDUs used for measuring channel information is relatively simple, however, with the outdoor scene of the next generation WiFi standard IEEE 802.11ax The introduction of new features such as uplink multi-user transmission, the single-mode probing PPDU is difficult to adapt to different requirements of different application scenarios. Therefore, IEEE 802.11ax also puts forward higher requirements for the detection of PPDUs in the link adaptation process. .

Summary of the invention

The embodiments of the present invention provide a WLAN link adaptation method and a network device, which can improve the flexibility of channel information measurement and provide accurate link adaptation for users.

A first aspect of the embodiments of the present invention provides a link adaptation method for a WLAN, including:

The first network device obtains a measurement result of the target channel information, where the measurement result of the target channel information is a measurement result obtained by measuring channel information of the physical layer protocol data unit PPDU of the target mode. fruit;

The first network device performs link adaptation adjustment according to the target channel information measurement result.

With reference to the first aspect of the embodiments of the present invention, in a first implementation manner of the first aspect of the embodiment, the acquiring, by the first network device, the measurement result of the target channel information includes:

The first network device sends a first PPDU to the second network device, where the first PPDU indicates that the second network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is a probe PPDU for instructing the second network device to generate a target mode;

The first network device receives the second PPDU sent by the second network device, where the second PPDU is a probe PPDU of the target mode generated by the second network device according to the mode indication field;

The first network device uses the second PPDU to measure channel information to obtain the target channel information measurement result.

With reference to the first aspect of the embodiments of the present invention, in a second implementation manner of the first aspect of the embodiments of the present disclosure, the acquiring, by the first network device, the measurement result of the target channel information includes:

Receiving, by the first network device, a PPDU sent by the second network device, where the PPDU indicates that the second network device actively sends the channel information measurement result, where the PPDU further includes a mode indication field, where the mode indication field is used to indicate a mode in which the network device measures the PPDU used by the channel information;

The first network device determines a target channel information measurement result according to the mode indication field.

With reference to the first aspect of the embodiment of the present invention, the first to the second implementation manner of the first aspect, in a third implementation manner of the first aspect of the embodiment of the present disclosure, the mode for detecting the PPDU includes: At least one of detecting the bandwidth information of the PPDU, detecting whether the PPDU is in the indoor mode or the outdoor mode, detecting the Fourier change order information of the long training field of the PPDU, and the guard interval information of the probe PPDU.

With reference to the first implementation manner of the first aspect of the embodiment of the present invention, in a fourth implementation manner of the first aspect of the embodiment, the mode for detecting the PPDU includes detecting whether the PPDU adopts an indoor mode or an outdoor mode;

When the mode indication field indicates that the second network device generates the probe PPDU of the outdoor mode, the second PPDU is a probe for the enhancement generated by the second network device according to the mode indication field. Measuring PPDU;

The enhanced probe PPDU refers to a probe PPDU having at least one of the following formats:

And at least one symbol of the preamble of the probe PPDU is partially or completely replicated in a time domain or a frequency domain, and a guard interval between some or all of the symbols of the probe PPDU is greater than a first preset value, where the probe PPDU is The modulation coding mode MCS of the at least one symbol satisfies a certain preset condition, and the Fourier variation order of the at least one symbol of the sounding PPDU is higher than the second preset value.

With reference to the first aspect of the embodiments of the present invention, any one of the first to fourth implementation manners of the first aspect, in a fifth implementation manner of the first aspect of the embodiments, the channel information includes Extended delay of the channel and/or delay between multiple users;

Performing link adaptation adjustment by the first network device according to the measurement result of the target channel information includes:

The first network device performs adaptive adjustment of the guard interval according to the target channel information measurement result.

With reference to the first aspect of the embodiments of the present invention, any one of the first to fourth implementation manners of the first aspect, in a sixth implementation manner of the first aspect of the embodiments, the channel information includes Signal to noise ratio SNR of the channel;

The first network device performs adaptive adjustment of the modulation and coding policy MCS according to the measurement result of the target channel information.

A second aspect of the embodiments of the present invention provides a link adaptation method for a WLAN, including:

The second network device receives the first PPDU sent by the first network device, where the first PPDU indicates that the second network device needs to send the probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used by Generating a PPDU indicating that the second network device generates the target mode;

Generating, by the second network device, a probe PPDU of the target mode according to the mode indication field;

The second network device sends a second PPDU to the first network device, where the second PPDU is used by the first network device to measure channel information by using the second PPDU, to obtain the target channel information measurement. As a result, and performing link adaptive adjustment according to the target channel information measurement result whole.

With reference to the second aspect of the embodiments of the present invention, in a first implementation manner of the second aspect of the embodiment, the mode for detecting a PPDU includes detecting bandwidth information of the PPDU, detecting whether the PPDU is in an indoor mode or an outdoor mode, and detecting a PPDU. At least one of Fourier variation order information of the long training field and guard interval information of the probe PPDU.

With reference to the second aspect of the embodiments of the present invention, in a second implementation manner of the second aspect of the embodiment, the mode for detecting a PPDU includes detecting whether the PPDU adopts an indoor mode or an outdoor mode;

When the mode indication field indicates that the second network device generates the probe PPDU of the outdoor mode, the generating, by the second network device, the probe PPDU of the target mode according to the mode indication field includes:

Generating, by the second network device, an enhanced probe PPDU according to the mode indication field;

With reference to the second aspect of the embodiment of the present invention, the first to the second implementation manner of the second aspect, in the third implementation manner of the second aspect of the embodiment, the channel information includes Extended delay of the channel and/or delay between multiple users;

The second PPDU is used by the first network device to measure an extended delay of the channel and/or a delay between multiple users using the second PPDU, and according to the measured extended delay of the channel and/or the delay between multiple users Perform adaptive adjustment of the guard interval.

With reference to the second aspect of the embodiment of the present invention, the first implementation manner of the second aspect, the fourth implementation manner of the second aspect of the embodiment,

The second PPDU is used by the first network device to measure the SNR of the channel by using the second PPDU, and performs adaptive adjustment of the MCS according to the measured SNR of the channel.

A third aspect of the embodiments of the present invention provides a link adaptation method for a WLAN, including:

The second network device generates a PPDU, where the PPDU indicates that the second network device actively sends the channel information measurement result, and the PPDU further includes a mode indication field, where the mode indication field is used a mode indicating a probe PPDU used by the second network device to measure channel information;

The second network device sends the PPDU to the first network device, where the PPDU is used by the first network device to determine a target channel information measurement result according to the mode indication field, and according to the target channel information measurement result Link adaptive adjustment.

With reference to the third aspect of the embodiments of the present invention, in a first implementation manner of the third aspect of the embodiment of the present invention, the mode of detecting a PPDU includes detecting bandwidth information of a PPDU, detecting whether the PPDU is in an indoor mode or an outdoor mode, and detecting a PPDU. At least one of Fourier variation order information of the long training field and guard interval information of the probe PPDU.

With reference to the third aspect of the embodiment of the present invention or the first implementation manner of the third aspect, in a second implementation manner of the third aspect of the embodiment of the present disclosure, the channel information includes an extended delay of the channel and/or multiple Delay between users;

The PPDU is used by the first network device to determine a target channel information measurement result according to the mode indication field, and perform adaptive adjustment of a guard interval according to the target channel information measurement result.

With reference to the third aspect of the embodiment of the present invention or the first implementation manner of the third aspect, in a third implementation manner of the third aspect of the embodiment, the channel information includes a signal to noise ratio SNR of the channel;

The PPDU is used by the first network device to determine a target channel information measurement result according to the mode indication field, and perform adaptive adjustment of the MCS according to the target channel information measurement result.

A fourth aspect of the embodiments of the present invention provides a network device, including:

An acquiring unit, configured to obtain a measurement result of the target channel information, where the measurement result of the target channel information is a measurement result obtained by measuring channel information of the physical layer protocol data unit PPDU of the target mode;

And an adjusting unit, configured to perform link adaptation adjustment according to the target channel information measurement result.

With reference to the fourth aspect of the embodiments of the present invention, in a first implementation manner of the fourth aspect of the embodiments, the acquiring unit includes:

a sending module, configured to send a first PPDU to the target network device, where the first PPDU indicates that the target network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used to indicate The target network device generates a probe PPDU of the target mode;

a first receiving module, configured to receive a second PPDU sent by the target network device, where The second PPDU is a probe PPDU of the target mode generated by the target network device according to the mode indication field;

And a first acquiring module, configured to measure channel information by using the second PPDU, to obtain the target channel information measurement result.

With reference to the fourth aspect of the embodiments of the present invention, in a second implementation manner of the fourth aspect of the embodiments, the acquiring unit includes:

a second receiving module, configured to receive a PPDU sent by the target network device, where the PPDU indicates that the target network device actively sends the channel information measurement result, where the PPDU further includes a mode indication field, where the mode indication field is used to indicate the target network. The mode in which the device measures the channel information used by the device to detect the PPDU;

And a second acquiring module, configured to determine, according to the mode indication field, a target channel information measurement result.

With reference to the fourth aspect of the embodiment of the present invention, the first to the second implementation manner of the fourth aspect, in a third implementation manner of the fourth aspect of the embodiment of the present invention, the mode for detecting the PPDU includes: At least one of detecting the bandwidth information of the PPDU, detecting whether the PPDU is in the indoor mode or the outdoor mode, detecting the Fourier change order information of the long training field of the PPDU, and the guard interval information of the probe PPDU.

With reference to the first implementation manner of the fourth aspect of the embodiments of the present invention, in a fourth implementation manner of the fourth aspect of the embodiments of the present disclosure, the mode of detecting the PPDU includes detecting whether the PPDU adopts an indoor mode or an outdoor mode;

When the mode indication field indicates that the target network device generates the probe PPDU of the outdoor mode, the second PPDU is an enhanced probe PPDU generated by the target network device according to the mode indication field;

In combination with the fourth aspect of the embodiments of the present invention, any of the first to fourth implementation forms of the fourth aspect In a fifth implementation manner of the fourth aspect of the embodiments of the present invention, the channel information includes an extended delay of the channel and/or a delay between multiple users;

The adjusting unit is specifically configured to perform adaptive adjustment of a guard interval according to the target channel information measurement result.

With reference to the fourth aspect of the embodiments of the present invention, the first to fourth implementation manners of the fourth aspect, in a sixth implementation manner of the fourth aspect of the embodiments of the present disclosure, the channel information includes The SNR of the channel;

The adjusting unit is specifically configured to perform adaptive adjustment of the modulation and coding policy MCS according to the measurement result of the target channel information.

A fifth aspect of the embodiments of the present invention provides a network device, including:

a receiving unit, configured to receive a first PPDU sent by the target network device, where the first PPDU indicates that the network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used by And a probe PPDU indicating that the network device generates a target mode;

a generating unit, configured to generate a probe PPDU of the target mode according to the mode indication field;

a sending unit, configured to send a second PPDU to the target network device, where the second PPDU is used by the target network device to measure channel information by using the second PPDU, to obtain the target channel information measurement result, and Link adaptation is performed according to the target channel information measurement result.

With reference to the fifth aspect of the embodiments of the present invention, in a first implementation manner of the fifth aspect of the embodiments of the present invention, the mode of detecting a PPDU includes detecting bandwidth information of a PPDU, detecting whether the PPDU is in an indoor mode or an outdoor mode, and detecting a PPDU. At least one of Fourier variation order information of the long training field and guard interval information of the probe PPDU.

With reference to the fifth aspect of the embodiments of the present invention, in a second implementation manner of the fifth aspect of the embodiments of the present disclosure, the mode for detecting a PPDU includes detecting whether the PPDU adopts an indoor mode or an outdoor mode;

When the mode indication field indicates that the network device generates the sounding PPDU of the outdoor mode, the generating unit is specifically configured to generate an enhanced sounding PPDU according to the mode indication field;

With reference to the fifth aspect of the embodiment of the present invention, the first to the second implementation manner of the fifth aspect, in a third implementation manner of the fifth aspect of the embodiment, the channel information includes Extended delay of the channel and/or delay between multiple users;

The second PPDU is used by the target network device to measure an extended delay of the channel and/or a delay between multiple users using the second PPDU, and according to the measured extended delay of the channel and/or the delay between multiple users. Adaptive adjustment of the guard interval.

With reference to the fifth aspect of the embodiment of the present invention, any one of the first to the second implementation manners of the fifth aspect, in a fourth implementation manner of the fifth aspect of the embodiment of the present disclosure, the channel information includes The SNR of the channel;

The second PPDU is used by the target network device to measure the SNR of the channel by using the second PPDU, and performs adaptive adjustment of the MCS according to the measured SNR of the channel.

A sixth aspect of the embodiments of the present invention provides a network device, including:

a generating unit, configured to generate a PPDU, where the PPDU indicates that the network device actively sends a channel information measurement result, where the PPDU further includes a mode indication field, where the mode indication field is used to indicate that the network device measures channel information The mode of the probe PPDU used;

a sending unit, configured to send the PPDU to a target network device, where the PPDU is used by the target network device to determine a target channel information measurement result according to the mode indication field, and perform a chain according to the target channel information measurement result Road adaptive adjustment.

With reference to the sixth aspect of the embodiments of the present invention, in a first implementation manner of the sixth aspect of the embodiments of the present invention, the mode of detecting a PPDU includes detecting bandwidth information of a PPDU, detecting whether the PPDU is in an indoor mode or an outdoor mode, and detecting a PPDU. At least one of Fourier variation order information of the long training field and guard interval information of the probe PPDU.

With reference to the sixth aspect of the embodiment of the present invention or the first implementation manner of the sixth aspect, in a second implementation manner of the sixth aspect of the embodiments of the present disclosure, the channel information includes an extended delay of the channel and/or multiple Delay between users;

And the PPDU is used by the target network device to determine a target channel information measurement result according to the mode indication field, and perform adaptive adjustment of a guard interval according to the target channel information measurement result.

With reference to the sixth aspect of the embodiment of the present invention or the first implementation manner of the sixth aspect, in a third implementation manner of the sixth aspect of the embodiment, the channel information includes a signal to noise ratio SNR of the channel;

The PPDU is used by the target network device to determine a target channel information measurement result according to the mode indication field, and perform adaptive adjustment of the MCS according to the target channel information measurement result.

In the technical solution provided by the embodiment of the present invention, the first network device obtains a measurement result of the target channel information, where the measurement result of the target channel information is a measurement result obtained by measuring channel information of the physical layer protocol data unit PPDU of the target mode; The target channel information measurement result is adjusted by the link adaptation. Therefore, the embodiment of the present invention can flexibly obtain the measurement result obtained by using the probe PPDU measurement channel information of a specific mode to adapt to different application scenarios. Different requirements improve the flexibility of channel information measurement, thus providing users with accurate link adaptation.

DRAWINGS

1 is a schematic diagram of a format of a MAC frame in an IEEE 802.11n standard;

2 is a schematic diagram showing the format of an HT control field in the IEEE 802.11n standard;

3 is a schematic diagram of a format of a link adaptation control field in FIG. 2;

4 is a schematic diagram showing the format of an HT control field in the IEEE 802.11ac standard;

FIG. 5 is a schematic diagram of an embodiment of a link adaptation method for a WLAN according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic diagram of another embodiment of a link adaptation method for a WLAN according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a format of detecting a PPDU according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of another embodiment of a link adaptation method for a WLAN according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of another embodiment of a link adaptation method for a WLAN according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of a format of an HT control field according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of another embodiment of a link adaptation method for a WLAN according to an embodiment of the present disclosure;

FIG. 12 is a schematic diagram of another embodiment of a link adaptation method for a WLAN according to an embodiment of the present disclosure;

FIG. 13 is a schematic diagram of another embodiment of a link adaptation method for a WLAN according to an embodiment of the present disclosure;

FIG. 14 is a schematic diagram of another embodiment of a link adaptation method for a WLAN according to an embodiment of the present disclosure;

14a is a schematic diagram of another format of an HT control field in an embodiment of the present invention;

FIG. 15 is a schematic diagram of an embodiment of a network device according to an embodiment of the present invention;

FIG. 16 is a schematic diagram of another embodiment of a network device according to an embodiment of the present disclosure;

FIG. 17 is a schematic diagram of another embodiment of a network device according to an embodiment of the present disclosure;

FIG. 18 is a schematic diagram of another embodiment of a network device according to an embodiment of the present disclosure;

FIG. 19 is a schematic diagram of another embodiment of a network device according to an embodiment of the present invention.

detailed description

The embodiments of the present invention provide a WLAN link adaptation method and a network device, which can improve the flexibility of channel information measurement and provide accurate link adaptation for users, which are respectively described in detail below.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that the embodiment of the present invention is applied to an OFDMA communication system in a wireless local area network, where the OFDMA communication system includes a first network device and at least one second network device, wherein the at least one second network device wirelessly The first network device is in communication connection.

For example, the first network device may be an AP (Access Point), and the second network device may be an STA (Station), or the first network device may also be an STA, and the second network device is an AP. .

It should be noted that, in the following embodiments, the principles and implementation manners of the present invention are exemplified by the link adaptation between the AP and the STA as a specific application scenario.

In order to facilitate the understanding of the embodiments of the present invention, the related technologies or terms introduced in the description of the embodiments of the present invention are described below:

First, high throughput control field

The AP or the STA performs link adaptation through an HT (High Throughput) control field in an Medium Access Control Protocol Data Unit (MPDU).

As shown in FIG. 1, it is a schematic diagram of a format of a MAC frame in the IEEE 802.11n standard. The HT control field is included in a frame header of the MAC frame, and is used to indicate information such as link adaptation and a calibration position, where the HT control field is generally present in a Control Wrapper frame, or when a frame control field is used. The order bit is set to 1 in the QoS data frame.

The following is a brief introduction to the format of the HT control field in some existing standards, such as the HT control field of the HT variant in the IEEE802.11n standard and the HT of the VHT (Very High Throughput) variant of the IEEE 802.11ac standard. Control field.

As shown in FIG. 2, it is a format diagram of an HT control field (ie, an HT control field of an HT variant) in the IEEE 802.11n standard, where the link adaptation control field in the HT control field in FIG. 2 is used for the pair and the link. The information is adapted to the related information. For details, refer to Figure 3, which is a schematic diagram of the format of the link adaptation control field.

The following is a brief introduction to the link adaptation process of one of the MCS (Modulation and Coding Scheme) in the IEEE 802.11n standard, hereinafter referred to as TRQ (Training Request) mode: link The adaptation requesting end sends a PPDU (Physical Layer Protocol Data Unit) including an HT control field of the HT variant to the responding end, wherein the TRQ is set to 1 to indicate that the responding end needs to send a probe PPDU; the responder is configured according to The HT control field of the HT variant generates a probe PPDU and sends the probe PPDU to the link adaptation requesting end; the link adaptation requester measures channel information according to the probe PPDU and performs link adaptation adjustment according to the channel information.

Based on the IEEE 802.11n standard, the HT control field of the VHT variant in the IEEE 802.11ac standard is more comprehensively designed, as shown in Figure 4, which is the HT control field in the IEEE 802.11ac standard (ie, the VHT variant). Schematic diagram of the HT Control field). The HT control field of the VHT variant multiplexes the HT control field of the HT variant, wherein the HT control field of the HT variant uses the first bit of the reserved bit as the VHT bit, and distinguishes the two versions by the VHT bit, when VHT When the bit is set to 0, the current HT control field is the HT control field of the HT variant. When the VHT bit is set to 1, the current HT control field is the HT control field of the VHT variant.

The following is a brief introduction to the link adaptation process of two MCSs in the IEEE 802.11ac standard, including request-feedback mechanism and unsolicited mode-feedback mechanism:

In a link adaptation procedure of the request-feedback mechanism, the link adaptation requesting end sends a probe PPDU to the responder, where VHT is set to 1 to indicate that the current HT control field is an HT control field of the VHT variant, VHT is set. 1, MRQ (MCS request) is set to 1 to indicate that the responding end needs to perform MCS feedback; then the responding end uses the above-mentioned probe PPDU to measure channel information and feed back the channel information measurement result to the link adaptation requesting end, so that the link adapts to the requesting end. The link adaptive adjustment is performed according to the channel information measurement result.

The unsolicited-feedback mechanism refers to the active feedback channel actively measuring the channel information measurement result for any frame or multi-frame data sent before the communication peer end when the communication peer does not send a feedback request. In a link adaptation process of the unsolicited-feedback mechanism, the active feedback end actively sends a PPDU including an HT control field of the VHT variant to its communication peer, where VHT is set to 1 to indicate that the current HT control field is The HT control field of the VHT variant, Unsolicited MFB (Unsolicited MCS feedback indicator) is set to 1 to indicate that the MCS feedback is an unsolicited active feedback and is carried in the MFB (MCS feedback, MCS feedback) field. Corresponding channel information measurement results, so that the communication peer performs link adaptive adjustment according to the channel information measurement result.

It should be noted that some common information in the HT control field, such as MSI/STBC (MCS request sequence guide/space-time block coding), is not introduced here. Those skilled in the art may refer to existing related standards and subsequent related. The provisions in the standard.

Second, link adaptation

In this embodiment, the parameter adjusted by the link adaptation may include at least one of an MCS, a GI (Guard Interval), redundancy information, a transmit power, and a time-frequency resource. In this embodiment, the channel parameters used for measuring channel information may be determined according to parameters adjusted by link adaptation, such as SNR (Signal to Noise Ratio) of the channel, extended delay of the channel, or delay between multiple users. Correspondingly, in the link adaptation process of the request-feedback mechanism and the non-request-response mechanism, the channel information measurement result obtained by measuring the channel information also includes a plurality of contents, for example, MCS, GI, or antenna selection.

For example, when the link adaptation of the MCS is the MCS, the channel information may include the SNR (Signal to Noise Ratio) of the channel, and the corresponding channel information measurement result may include: Number of spatiotemporal flows, recommended MCS, recommended strap for MCS Wide, average efficient SNR, etc.

If the link adaptation of the GI, that is, the parameter adjusted by the link adaptation is the MCS, the channel information may include an extended delay of the channel and/or a delay between multiple users, and the corresponding channel information measurement result may include the suggested GI.

It should be noted that, in some embodiments below, the principle and implementation manner of the present invention are exemplarily illustrated by using link adaptation of the GI as a specific application scenario.

Referring to FIG. 5, an embodiment of a link adaptation method for a WLAN in an embodiment of the present invention includes:

501. The first network device acquires a measurement result of the target channel information.

The measurement result of the target channel information is a measurement result obtained by measuring the channel information of the probe PPDU according to the target mode. Therefore, the step 501 is specifically understood as: first, the first network device determines the probe PPDU of the target mode, and then obtains the target using the target. The mode detection PPDU measures the channel channel measurement result obtained by the channel information.

In this embodiment, the first network device may determine the probe PPDU of the target mode according to the application scenario, that is, select a probe PPDU corresponding to the target mode in different application scenarios, for example, the first network device may be according to the indoor The scenario is still an outdoor scenario, the channel information to be measured, the accuracy requirement of the channel information, the feedback efficiency requirement, the busy condition of the channel in the cell, etc. to determine the detection PPDU of the target mode, where the selection rule of the mode of detecting the PPDU is not limited. .

It should be noted that, in this embodiment, the mode of detecting the PPDU may include detecting the bandwidth information of the PPDU, detecting whether the PPDU is in the indoor mode or the outdoor mode, and detecting the Fourier transform of the LTF (Long Training Field) of the PPDU. At least one of the order information and the guard interval information of the probe PPDU. The bandwidth information of the probe PPDU refers to which bandwidth the probe PPDU uses; the Fourier transform order information of the long training field of the probe PPDU refers to the FFT (Fast Fourier Transformation) of the probe PPDU. ), for example, a 64-point FFT, or a larger FFT, such as a 128-point FFT or a 256-point FFT.

It can be understood that, in this embodiment, in the link link adaptation process of different mechanisms, the manner of obtaining the measurement result of the target channel information will also be different. Specifically, how to obtain the measurement result of the target channel information will be followed. The details continue to be described in the embodiments.

502. The first network device performs link adaptive adjustment according to the measurement result of the target channel information.

In this embodiment, the channel information measurement result referenced by the link adaptation adjustment is used. The probe mode of the target mode is obtained by measuring the channel information, and thus the channel information measurement result is more targeted for the current application scenario, thereby providing accurate link adaptation for the user.

In the following, a link adaptation process of the TRQ mode is introduced from the perspective of the first network device. Referring to FIG. 6, another embodiment of the WLAN link adaptation method in the embodiment of the present invention includes:

601. The first network device sends a first PPDU to the second network device.

In this embodiment, the first PPDU indicates that the second network device needs to send the probe PPDU. It can be understood that, in the actual application process, the first PPDU may indicate the need of the second network device by using its preamble field or the MPDU it carries. The probe PPDU is sent, which is not limited here.

In this embodiment, the first PPDU further includes a mode indication field, for example, a T-Mode (Required Training PPDU mode) field, where the T-Mode field is used to indicate the second network device. The probe PPDU of the target mode is generated. It can be understood that, in an actual application process, the T-Mode field may be included in a preamble field of the first PPDU (for example, a SIG-B field), or may be included in the MPDU of the first PPDU. In the specific case, there is no limitation here.

The following describes in detail how the T-Mode field instructs the second network device to generate the probe PPDU of the target mode.

(1) the first field;

For example, the first field is recorded as a BW (Bandwidth) field, and the BW field is used to indicate the bandwidth that the PPDU should be used for, that is, when the mode of detecting the PPDU includes detecting the bandwidth information of the PPDU, the PW field may be used to indicate the detection of the PPDU. Which bandwidth.

(2) the second field;

For example, the second field is recorded as an Indoor/Outdoor (Indoor mode or Outdoor mode) field, and the Indoor/Outdoor field is used to indicate whether the probe PPDU should be in indoor mode or outdoor mode, that is, the mode in which the PPDU is detected includes detection. Whether the PPDU is indoor or outdoor In the mode, the Indoor/Outdoor field can be used to indicate whether the PPDU is detected in indoor mode or outdoor mode.

(3) the third field;

For example, the third field is denoted as NX_HE-LTF (N*64 FFT of HE-LTF), which is used to indicate the order of the FFT to be used for detecting the long training field of the PPDU. The number, that is, when the mode of detecting the PPDU includes detecting the Fourier transform order information of the long training field of the PPDU, the NX_HE-LTF field may indicate which FFT of the order the PPDU is used for, for example, in actual application, The order of the current FFT can be expressed as N times of 64 on the basis of 64 points, wherein N can be 1, 2, 4, and the like.

(4) the fourth field;

For example, the fourth field is recorded as a GI field, which is used to indicate the length of the guard interval that the probe PPDU should be used. That is, when the mode of detecting the PPDU includes detecting the guard interval information of the PPDU, the GI field may indicate which probe the PPDU is used. The GI of the length, for example, 0.4, 0.8us, or a longer GI, such as 1.6, 2.4 or 3.2us.

It can be understood that the mode of the probe PPDU may further include more information for describing the parameters of the probe PPDU, which is not limited herein. Correspondingly, corresponding fields may be set to indicate related information.

602. The first network device receives a second PPDU sent by the second network device.

In this embodiment, the second PPDU is a probe PPDU of the target mode generated by the second network device according to the T-Mode field.

For example, when the Indoor/Outdoor field indicates that the probe PPDU should be in the outdoor mode, the probe PPDU corresponding to the generated target mode (ie, the probe PPDU of the outdoor mode) is an enhanced probe PPDU. Referring to FIG. 7, the enhanced probe PPDU is used. Refers to a probe PPDU that has at least one of the following formats:

(1) at least one symbol of the preamble of the probe PPDU is partially or completely copied in the time domain or the frequency domain;

That is, in the process of generating the probe PPDU, the second network device performs partial or complete copying of a certain symbol in the time domain or the frequency domain in the preamble. As shown in FIG. 7, the L-SIG symbol is completely copied.

(2) detecting that the GI between part or all of the symbols of the PPDU is greater than the first preset value;

That is, the second network device adopts a longer GI in the process of generating the probe PPDU, wherein the first preset value may be set according to an actual scenario, for example, may be 0.8 us, and the probe mode of the outdoor mode may adopt a PPDU other than the traditional probe. Longer GIs, such as 1.6, 2.4, 3.2us, etc., at this time, increasing the GI helps to resist large extended delays in outdoor scenes.

(3) detecting that the MCS of at least one symbol of the PPDU satisfies a certain preset condition;

That is, in the process of generating the sounding PPDU, the second network device is more robust in detecting the MCS of at least one symbol of the PPDU, for example, the most robust MCS0 from MCS0 to MCS9, or the MCS10 in the IEEE802.11ah standard, The robustness is better than MCS0. Therefore, in the actual application process, the signaling field or data field of the probe PPDU can adopt the modulation and coding mode of the MCS10.

(4) The order of the FFT of the at least one symbol of the probe PPDU is higher than the second preset value.

That is, in the process of generating the probe PPDU, the second network device may use a larger order FFT, such as a 128-point FFT or a 256-point FFT. In this case, a larger FFT can not only improve efficiency, but also reduce The impact of extended latency.

It should be noted that the format of the PPDU of the outdoor mode is described by way of example only. In actual applications, the format of the PPDU of the outdoor mode may be combined with the foregoing format, and more may be set as needed. The other format, for example, may further re-introducing an indication field for indicating a variable mode of the subsequent field, for example, indicating a GI information of the signaling field-B by a certain field in the signaling field -A, The GI information of the data field and the like are indicated by a certain field of the signaling field -B.

603. The first network device uses the second PPDU to measure channel information, to obtain a target channel information measurement result.

In this embodiment, the second PPDU is a probe PPDU of a target mode generated according to the T-Mode field, and thus, the channel information is measured using the probe PPDU, and the target channel information measurement result is obtained.

604. The first network device performs link adaptive adjustment according to the measurement result of the target channel information.

Optionally, in this embodiment, the channel information includes an extended delay of the channel and/or a delay between the multiple users, and the corresponding target channel information measurement result is the target GI, and the step 604 is specifically: the first network device is configured according to the target GI. Perform adaptive adjustment of the GI.

Alternatively, in this embodiment, the channel information may also include the SNR of the channel, and the corresponding target channel information measurement result is the target MCS. Step 604 is specifically: the first network device performs adaptive adjustment of the MCS according to the target MCS.

It can be understood that, in this embodiment, the channel parameters used for measuring channel information may be determined according to parameters adjusted by link adaptation.

In the technical solution provided by the embodiment of the present invention, the first network device sends a first PPDU to the second network device, where the first PPDU indicates that the second network device needs to send the probe PPDU, and the first PPDU further includes a mode indication field. The mode indication field is used to indicate that the second network device generates the probe PPDU of the target mode, and receives the second PPDU, where the second PPDU is a probe PPDU of the target mode generated by the second network device according to the mode indication field; The second PPDU measures the channel information, obtains the measurement result of the target channel information, and performs link adaptive adjustment according to the measurement result of the target channel information. Therefore, in the embodiment of the present invention, the first PPDU further carries a mode indication field to specify a mode for detecting the PPDU, so that the channel information of the corresponding mode of the PPDU can be measured, and the corresponding channel information is obtained. As a result, the embodiment of the present invention can flexibly obtain the measurement result obtained by using the PPDU measurement channel information of a specific mode to adapt to different requirements in different application scenarios, and improve the flexibility of channel information measurement, thereby serving the user. Provide accurate link adaptation.

In the following, a link adaptation process of the TRQ mode is introduced from the perspective of the second network device. Referring to FIG. 8, another embodiment of the WLAN link adaptation method in the embodiment of the present invention includes:

801. The second network device receives the first PPDU sent by the first network device.

In this embodiment, the first PPDU further includes a mode indication field, where the mode indication field is used to indicate that the second network device generates the probe PPDU of the target mode, where the description about the mode indication field may be implemented by referring to FIG. 6 . The description of step 601 in the example is not described here.

802. The second network device generates a second PPDU of the target mode according to the mode indication field.

In this embodiment, after receiving the first PPDU sent by the first network device, the second network device reads the mode indication field therein, and generates a corresponding target mode according to the mode indication field. The PPDU is measured, that is, the second PPDU.

803. The second network device sends a second PPDU to the first network device.

The second PPDU is used by the first network device to measure channel information by using the second PPDU, to obtain a target channel information measurement result, and perform link adaptation adjustment according to the target channel information measurement result.

The following describes the link adaptation method of the WLAN in the TRQ mode by using the mode indication field in the HT control field of the first PPDU as an example, as shown in the embodiment shown in FIG. FIG. 9 is another embodiment of a link adaptation method for a WLAN in an embodiment of the present invention, including:

901. The first network device sends a first PPDU to the second network device.

The first PPDU carries at least one MPDU, and the MPDU indicates that the second network device needs to send the probe PPDU. For example, in the actual application process, the second network device may be required to send the probe PPDU by setting the TRQ bit to 1. Please refer to Figure 10 for details.

In this embodiment, the MPDU includes an HT control field, and the HT control field further includes a T-Mode field, where the T-Mode field is used to instruct the second network device to generate a probe PPDU of the target mode, as shown in FIG. 10: a BW field. It is used to indicate the bandwidth that should be used for detecting the PPDU; the Indoor/Outdoor field is used to indicate whether the probe PPDU should be in indoor mode or outdoor mode, and the NX_HE-LTF field is used to indicate the order of the FFT to be used for detecting the long training field of the PPDU; The GI field is used to indicate the length of the guard interval that the probe PPDU should take.

It is to be understood that the T-Mode field may further include more fields for indicating the parameters of the probe PPDU, which is not limited herein.

In the actual application process, the T-Mode field may be set according to the application scenario to indicate the target mode of the probe PPDU, where the application scenario includes an indoor scenario or an outdoor scenario, channel information to be measured, and channel channel accuracy. Requirements, feedback efficiency requirements, busy conditions of the channel in the cell, etc., as an example:

If the first network device is an indoor scenario, the Indoor/Outdoor field of the T-Mode field may be set to the indoor mode, thereby generating an indoor mode detection PPDU, and the GI of the detection PPDU is shorter, such as 0.8 us, thereby ensuring On the premise that the first network device obtains the channel information measurement result, the overhead caused by the second network device sending the probe PPDU is minimized.

If the channel information to be measured by the first network device is an extended delay, the GI field of the T-Mode field may be set to the longest GI to ensure that the GI length of the long training field of the probe PPDU is greater than the extended delay of the current channel, otherwise The signals on multiple paths of the channel will overlap, and even if the probe PPDU is received, the extended delay of the current channel cannot be correctly measured.

If the first network device requires high accuracy of channel information, if it is desired to measure channel information of all subcarriers, the NX_HE-LTF field of the T-Mode field may be set to 4X HE-LTF; If the channel correlation feature of the adjacent subcarrier is high, the NX_HE-LTF field of the T-Mode field can be set to 1X HE-LTF or 2X HE-LTF. At this time, the first network device passes the 1X HE-LTF or 2X HE. - The channel measured by the LTF is interpolated, and the overhead caused by the second network device transmitting the probe PPDU is minimized on the premise that the channel information on all subcarriers is obtained.

For example, according to the busy condition of the channel in the cell, when the transmission efficiency is higher on a certain channel (such as 20M), the BW field of the T-Mode field can be set to 20M bandwidth, thereby, the second network device The opportunity to transmit the probe PPDU can be acquired more quickly so that the first network device can measure the channel information as soon as possible.

It should be noted that the specific manner in which the first network device sets the T-Mode field is described by using only a few examples. In an actual application, the first network device may use the foregoing setting manner in combination, and may also adopt other settings. The way, the specific setting method is not limited here.

For details about the T-Mode field, refer to step 601 in the embodiment shown in FIG. 6. The following describes the specific format of the T-Mode field in detail:

First, it should be noted that, in this embodiment, a new version identifier field may be added to the MPDU in the embodiment of the present invention, for example, as a HE bit. Therefore, the HT control field in the embodiment of the present invention may be understood. The HT control field for the HE variant. In the actual application process, in order to achieve backward compatibility of the version, the HE bit is set to the next bit position of the VHT bit based on the HT control field of the VHT variant. It can be understood that the version identifier field may not be included in some specific application scenarios.

In this embodiment, the specific location of the T-Mode field and the number of bits are not limited. For example, as shown in FIG. 10, the BW field may include 2 bits, and the Indoor/Outdoor field may include one bit, and the NX_HE-LTF field. It can include 2 bits, and the GI field can include 2 bits.

Optionally, in this embodiment, the MPDU may further include a fifth field, for example, as Required. (Number of Training PPDUs to be transmitted), the Required field is used to indicate the number of probe PPDUs that the second network device needs to send. Of course, in some other embodiments, the Required field may also be included in other parts of the first PPDU, such as a preamble field.

Optionally, in this embodiment, the MPDU may include a Control Wrapper frame, a QoS data frame when the sequence bit of the frame control field is set to 1, a beacon frame, a probe response frame, or an associated response frame. . In the actual application process, some types of other types of frames may also be included, and the frame type of the MPDU is not limited herein.

902. The second network device generates a second PPDU of the target mode according to the mode indication field.

In this embodiment, after receiving the first PPDU sent by the first network device, the second network device reads the T-Mode field therein, and generates a detection PPDU of the corresponding target mode according to the T-Mode field, that is, the first Two PPDUs.

In this embodiment, corresponding to the Required field, the second PPDU may further include a sixth field, for example, a field of Remaining (Number of Remaining Training PPDU need to be transmitted), which is a field. The Remaining field is used to indicate that the second network device subsequently sends the number of probe PPDUs.

For details about the detection of the PPDU, refer to step 602 in the embodiment shown in FIG. 6, and details are not described herein again.

903. The second network device sends a second PPDU to the first network device.

904. The first network device uses the second PPDU to measure channel information, to obtain a target channel information measurement result.

905. The first network device performs link adaptive adjustment according to the measurement result of the target channel information.

Steps 904 to 905 in this embodiment are the same as steps 603 to 604 in the embodiment shown in FIG. 6, and details are not described herein again.

For ease of understanding, a GI link adaptation procedure in the TRQ mode is introduced in a specific application scenario in conjunction with the HT control field shown in FIG. 10. Referring to FIG. 11, the WLAN link in the embodiment of the present invention is self-described. One embodiment of the adaptation method includes:

1101: The AP sends a first PPDU carrying an HT control field of the HE variant to the STA.

In this embodiment, the VHT bit and the HE bit of the HT control field are both set to indicate The current HT Control field is the HT Control field of the HE variant; TRQ is set to 1 to indicate that the GI link will be TRQ mode adaptive; then the T-Mode field and the Required field are set.

1102: The STA generates a second PPDU of the target mode according to the first PPDU.

In this embodiment, the STA reads the MPDU, and the TRQ knows that the probe PPDU needs to be sent, and further reads the T-Mode field, learns the mode of the probe PPDU to be sent, and reads the Required field to obtain the required transmission. The number of probed PPDUs is generated, and a corresponding probe PPDU, that is, a second PPDU, is generated. In this embodiment, the second PPDU carries the HT control field, and sets the VHT bit and the HE bit of the HT control field to 1 to indicate that the current HT control field is the HT control field of the HE variant, and then sets the Remaining field to Indicates the number of probe PPDUs that the STA will also send later.

1103. The STA sends a second PPDU to the AP.

1104, the AP uses the second PPDU to measure the extended delay of the channel and/or the delay between multiple users to obtain the target GI;

The AP measures the extended delay and/or the delay between multiple users through the long training field of the second PPDU.

1105. The AP performs an adaptive adjustment of the GI according to the target GI.

In this embodiment, after obtaining the target GI, the AP can perform adaptive adjustment of the GI according to the target GI.

A link adaptation process of the non-request-feedback mechanism is introduced from the perspective of the first network device. Referring to FIG. 12, another embodiment of the WLAN link adaptation method in the embodiment of the present invention includes:

1201: The first network device receives the PPDU sent by the second network device.

In this embodiment, the PPDU indicates that the second network device actively sends the channel information measurement result to indicate the link adaptation that will perform the unrequest-feedback mechanism. It can be understood that the PPDU can pass its preamble in the actual application process. The field or the MPDU carried by the field indicates that the second network device actively sends the channel information measurement result, which is not limited herein.

In this embodiment, the first PPDU further includes a mode indication field, for example, a T-Mode (Training PPDU mode) field, where the T-Mode field is used to indicate that the second network device measures the channel information. The mode of the probe PPDU used; it is understandable that in practice In the application process, the T-Mode field may be included in the preamble field of the first PPDU (for example, the SIG-B field), or may be included in the MPDU of the first PPDU, which is not limited herein.

The following describes in detail how the T-Mode field indicates the mode of the probe PPDU used by the second network device to measure channel information.

(1) the first field;

For example, the first field is recorded as a BW (Bandwidth) field, and the BW field is used to indicate the bandwidth used by the probe PPDU. That is, when the mode of detecting the PPDU includes detecting the bandwidth information of the PPDU, the BW field may indicate that the probe PPDU is adopted. Which bandwidth.

(2) the second field;

For example, the second field is recorded as an Indoor/Outdoor (Indoor mode or Outdoor mode) field, and the Indoor/Outdoor field is used to indicate whether the probe PPDU adopts an indoor mode or an outdoor mode, that is, the mode of detecting the PPDU includes detecting the PPDU. When using indoor mode or outdoor mode, you can use the Indoor/Outdoor field to indicate whether the PPDU is detected in indoor mode or outdoor mode.

(3) the third field;

For example, the third field is denoted as NX_HE-LTF (N*64 FFT of HE-LTF, FFT order of efficient long training field) field, which is used to indicate the order of the FFT used by the long training field of the probe PPDU. That is, when the mode of detecting the PPDU includes detecting the Fourier transform order information of the long training field of the PPDU, the NX_HE-LTF field may be used to indicate which FFT is used to detect the PPDU, for example, in actual application, The order of the current FFT can be expressed as N times of 64 on the basis of 64 points, wherein N can be 1, 2, 4, and the like.

(4) the fourth field;

For example, the fourth field is recorded as a GI field, which is used to indicate the length of the guard interval used by the probe PPDU. That is, when the mode of detecting the PPDU includes detecting the guard interval information of the PPDU, the GI field may indicate which probe the PPDU is used. The GI of the length, for example, 0.4, 0.8us, or a longer GI, such as 1.6, 2.4 or 3.2us.

It should be noted that, in the link adaptation process of the non-request-response mechanism, the second network device may actively send multiple PPDUs to the first network device, so as to continuously feed back multiple channel information to the first network device without interruption. Measurement results. It can be understood that, in actual application, the second network device may measure channel information in any mode of detecting PPDU, for example, the second network device may use the outdoor mode detection PPDU to measure channel information, or the second network device may use The channel information is measured in the indoor mode detection PPDU (the detection of the PPDU in the outdoor mode may be referred to the step 602 in the embodiment shown in FIG. 6 ), which is not limited herein.

1202. The first network device determines a target channel information measurement result according to the mode indication field.

In this embodiment, after receiving the PPDU, the first network device may learn, according to the mode indication field, which channel information measurement result indicated by the PPDU is measured using which mode of the probe PPDU, and determine whether to use the mode. The measurement result obtained by detecting the PPDU measurement channel information is used as the channel information measurement result referenced by the subsequent link adaptation adjustment, and if yes, determining the channel information measurement result as the target channel information measurement result.

It can be understood that, in the link adaptation process of the non-request-feedback mechanism, the first network device may receive the multiple PPDUs sent by the second network device, and learn the channel in each PPDU according to the indication of the mode indication field. The information measurement result is obtained by using which mode of the probe PPDU measurement, and thus, the first network device wants to obtain the measurement result obtained by using the probe PPDU measurement channel information of a specific mode, and only needs to perform the indication according to the mode indication field. Select to adapt to different needs in different application scenarios.

1203. The first network device performs link adaptive adjustment according to the measurement result of the target channel information.

In this embodiment, the target channel information measurement result is a measurement result obtained by the first network device using the probe PPDU measurement channel information of a specific mode, thereby, the first network device can flexibly select which mode of detection to use. The measurement result obtained by the PPDU measurement channel information is subjected to link adaptive adjustment.

In the technical solution provided by the embodiment of the present invention, the first network device receives the PPDU sent by the second network device, where the PPDU indicates that the second network device actively sends the channel information measurement result, and the PPDU further includes a mode indication field, where the mode The indication field is used to indicate a mode of the probe PPDU used by the second network device to measure the channel information; the first network device determines the target channel information measurement result according to the mode indication field; and performs link adaptation adjustment according to the target channel information measurement result, Thus, The first network device can flexibly select which mode of the probe PPDU measurement channel information is used to perform link adaptation adjustment. Therefore, in the embodiment of the present invention, the PPDU further carries a mode indication field to specify a mode of the probe PPDU used for measuring the channel information, so that the first network device knows which channel information measurement result is used. The mode of detecting the PPDU is obtained. Therefore, the embodiment of the present invention can flexibly obtain the measurement result obtained by using the PPDU measurement channel information of a specific mode to adapt to different requirements in different application scenarios, and improve channel information measurement. Flexibility to provide users with accurate link adaptation.

A link adaptation process of the non-request-feedback mechanism is introduced from the perspective of the second network device. Referring to FIG. 13, another embodiment of the WLAN link adaptation method in the embodiment of the present invention includes:

1301. The second network device generates a PPDU.

In this embodiment, the PPDU indicates that the second network device actively sends the channel information measurement result to indicate the link adaptation that will perform the unrequest-feedback mechanism. It can be understood that, in the actual application process, the PPDU can pass through the PPDU. The preamble field or the MPDU carried by the preamble field indicates that the second network device actively sends the channel information measurement result, which is not limited herein.

In this embodiment, the PPDU further includes a mode indication field, where the mode indication field is used to indicate a mode of the probe PPDU used by the second network device to measure the channel information, where the description about the mode indication field may be referred to FIG. The description of step 1201 in the embodiment is not described herein again.

1302. The second network device sends a PPDU to the first network device.

In this embodiment, the PPDU is used by the first network device to determine a target channel information measurement result according to the mode indication field, and perform link adaptation adjustment according to the target channel information measurement result. Specifically, the first network device determines, according to the mode indication field, the target channel information measurement result, and according to the For the process of performing link adaptation adjustment on the target channel information measurement result, reference may be made to step 1202 and step 1203 in the embodiment shown in FIG.

The WLAN link adaptation method of the non-request-response mechanism is described in detail in the following, based on the embodiment shown in FIG. 12 and FIG. 13 , in which the mode indication field is included in the HT control field of the PPDU. Referring to FIG. 14, another embodiment of a link adaptation method for a WLAN in an embodiment of the present invention includes:

1401. The second network device generates a PPDU.

In this embodiment, the PPDU carries at least one MPDU, and the MPDU indicates that the second network device actively sends the channel information measurement result to indicate link adaptation that will perform an unsolicited-feedback mechanism. It can be understood that the MPDU also carries the channel information measurement result. For example, in an actual application process, the second network device may be instructed to actively send channel information measurement results by setting an Unsolicited MFB (Unsolicited GI Feedback) field, where the channel information measurement result is carried in the GFB ( In the GI Feedback field, to indicate a suitable GI to the first network device, please refer to FIG. 14a.

In this embodiment, the MPDU includes an HT control field, and the HT control field further includes a T-Mode field, where the T-Mode field is used to indicate a mode of the probe PPDU used by the second network device to measure channel information, as shown in FIG. 14a. The BW field is used to indicate the bandwidth used by the probe PPDU; the Indoor/Outdoor field is used to indicate whether the probe PPDU is in the indoor mode or the outdoor mode, and the NX_HE-LTF field is used to indicate the order of the FFT used for detecting the long training field of the PPDU. The GI field is used to indicate the length of the guard interval used by the probe PPDU.

It is to be understood that the T-Mode field may further include more fields for indicating the parameters of the probe PPDU, which is not limited herein. For details of the T-Mode field, reference may be made to step 1201 in the embodiment shown in FIG. In this embodiment, the specific location of the T-Mode field and the number of bits are not limited. For details, refer to step 901 in the embodiment shown in FIG.

Optionally, in this embodiment, the MPDU may include a Control Wrapper frame, a QoS data frame when the sequence bit of the frame control field is set to 1, a probe request frame or an association request frame, and the like. In the actual application process, some types of other types of frames may also be included, and the frame type of the MPDU is not limited herein.

1402. The second network device sends a PPDU to the first network device.

1403. The first network device determines, according to the mode indication field, a target channel information measurement result.

1404. The first network device performs link adaptive adjustment according to the measurement result of the target channel information.

Steps 1403 to 1404 in this embodiment are the same as steps 1202 to 1203 in the embodiment shown in FIG. 12, and details are not described herein again.

The WLAN link adaptation method in the embodiment of the present invention is described above. The following describes the network device in the embodiment of the present invention. Referring to FIG. 15, an embodiment of the network device in the embodiment of the present invention includes:

The network device in the embodiment of the present invention may implement the process of the embodiment shown in Figure 5, where the network device includes:

The acquiring unit 1510 is configured to obtain a measurement result of the target channel information, where the measurement result of the target channel information is a measurement result obtained by measuring channel information of the physical layer protocol data unit PPDU of the target mode;

The adjusting unit 1520 is configured to perform link adaptation adjustment according to the target channel information measurement result.

For ease of understanding, the internal operation process of the network device in this embodiment is described by taking a specific application scenario as an example:

The obtaining unit 1510 obtains a measurement result of the target channel information, where the measurement result of the target channel information is a measurement result obtained by measuring channel information of the physical layer protocol data unit PPDU of the target mode; and the adjusting unit 1520 performs chain according to the measurement result of the target channel information. Road adaptive adjustment.

In the technical solution provided by the embodiment of the present invention, the acquiring unit 1510 of the network device acquires a measurement result of the target channel information, where the measurement result of the target channel information is a measurement result obtained by measuring channel information of the physical layer protocol data unit PPDU of the target mode; The adjustment unit 1520 performs the link adaptation adjustment according to the target channel information measurement result. Therefore, the embodiment of the present invention can flexibly acquire the measurement result obtained by using the probe PPDU measurement channel information of a specific mode to adapt to the prior art. With different requirements in different application scenarios, the flexibility of channel information measurement is improved, thereby providing users with accurate link adaptation.

A network device in the TRQ mode is described below. Referring to FIG. 16, another embodiment of the method for the network device in the embodiment of the present invention includes:

The network device in the embodiment of the present invention may implement the process of the embodiment shown in FIG. Includes:

The sending module 1611 is configured to send a first PPDU to the target network device, where the first PPDU indicates that the target network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used. Instructing the target network device to generate a probe PPDU of the target mode;

a first receiving module 1612, configured to receive a second PPDU sent by the target network device, where the second PPDU is a probe PPDU of a target mode generated by the target network device according to the mode indication field;

The first obtaining module 1613 is configured to measure channel information by using the second PPDU to obtain the target channel information measurement result.

The adjusting unit 1620 is configured to perform link adaptation adjustment according to the target channel information measurement result.

Optionally, in this embodiment, the mode of detecting the PPDU includes detecting the bandwidth information of the PPDU, detecting whether the PPDU adopts the indoor mode or the outdoor mode, detecting the Fourier transform order information of the long training field of the PPDU, and detecting the guard interval of the PPDU. At least one of the information.

Optionally, in this embodiment, the mode of detecting the PPDU includes: detecting whether the PPDU adopts an indoor mode or an outdoor mode; and when the mode indication field indicates that the target network device generates the detection PPDU of the outdoor mode, the second PPDU is An enhanced probe PPDU generated by the target network device according to the mode indication field;

Optionally, in this embodiment, the channel information includes an extended delay of the channel and/or a delay between multiple users;

The adjusting unit 1620 is specifically configured to perform adaptive adjustment of the guard interval according to the measurement result of the target channel information.

Optionally, in this embodiment, the channel information includes an SNR of the channel;

The adjusting unit 1620 is specifically configured to perform adaptive adjustment of the modulation and coding policy MCS according to the measurement result of the target channel information.

In the technical solution provided by the embodiment of the present invention, the sending module 1611 of the network device sends a first PPDU to the target network device, where the first PPDU indicates that the target network device needs to send the probe PPDU, and the first PPDU further includes a mode indication field. The mode indication field is used to indicate that the target network device generates the probe PPDU of the target mode; and the second PPDU is received by the first receiving module 1612, where the second PPDU is a probe PPDU of the target mode generated by the target network device according to the mode indication field. Then, the first acquisition module 1613 uses the second PPDU to measure the channel information to obtain the target channel information measurement result, and the adjustment unit 1620 performs link adaptation adjustment according to the target channel information measurement result. Therefore, in the embodiment of the present invention, the first PPDU further carries a mode indication field to specify a mode for detecting the PPDU, so that the channel information of the corresponding mode of the PPDU can be measured, and the corresponding channel information is obtained. As a result, the embodiment of the present invention can flexibly obtain the measurement result obtained by using the PPDU measurement channel information of a specific mode to adapt to different requirements in different application scenarios, and improve the flexibility of channel information measurement, thereby serving the user. Provide accurate link adaptation.

The following describes another network device in the TRQ mode. Referring to FIG. 17, another embodiment of the method for the network device in the embodiment of the present invention includes:

The network device in the embodiment of the present invention may implement the process of the embodiment shown in Figure 8. The network device includes:

The receiving unit 1710 is configured to receive a first PPDU sent by the target network device, where the first PPDU indicates that the network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is a probe PPDU for instructing the network device to generate a target mode;

a generating unit 1720, configured to generate a probe PPDU of the target mode according to the mode indication field;

a sending unit 1730, configured to send a second PPDU to the target network device, where the second PPDU is used by the target network device to measure channel information by using the second PPDU, to obtain the target channel information measurement result, And performing link adaptive adjustment according to the target channel information measurement result.

A network device of the non-request-response mechanism is described below. Referring to FIG. 18, another embodiment of the method for the network device in the embodiment of the present invention includes:

The network device in the embodiment of the present invention may implement the process of the embodiment shown in Figure 12, where the network device includes:

The second receiving module 1811 is configured to receive a PPDU sent by the target network device, where the PPDU indicates that the target network device actively sends the channel information measurement result, where the PPDU further includes a mode indication field, where the mode indication field is used to indicate the target. The mode in which the network device measures the PPDU used by the channel information;

a second obtaining module 1812, configured to determine, according to the mode indication field, a target channel information measurement result;

The adjusting unit 1820 is configured to perform link adaptation adjustment according to the target channel information measurement result.

The adjusting unit 1820 is specifically configured to perform adaptive adjustment of the guard interval according to the target channel information measurement result.

The adjusting unit 1820 is specifically configured to perform adaptive adjustment of the modulation and coding policy MCS according to the measurement result of the target channel information.

In the technical solution provided by the embodiment of the present invention, the second receiving module 1811 of the network device receives the PPDU sent by the target network device, where the PPDU indicates that the target network device actively sends the channel information measurement result, and the PPDU further includes a mode indication field. The mode indication field is used to indicate a mode of the probe PPDU used by the target network device to measure the channel information; and the target channel information measurement result is determined by the second obtaining module 1812 according to the mode indication field; and then measured by the adjusting unit 1820 according to the target channel information. As a result, link adaptation is performed, whereby the network device can flexibly select which mode of the PPDU measurement channel information is used to perform link adaptive adjustment. Therefore, in the embodiment of the present invention, the PPDU further carries a mode indication field to specify a mode of the probe PPDU used for measuring the channel information, so that the network device knows which channel information measurement result is used. The mode of detecting the PPDU is obtained. Therefore, the embodiment of the present invention can flexibly obtain the measurement result obtained by using the PPDU measurement channel information of a specific mode to adapt to different requirements in different application scenarios, and improve channel information measurement. Flexibility to provide users with accurate link adaptation.

The following is another description of the network device of the non-request-feedback mechanism. Referring to FIG. 19, another embodiment of the method for the network device in the embodiment of the present invention includes:

The network device in the embodiment of the present invention may implement the process of the embodiment shown in Figure 13, where the network device includes:

The generating unit 1910 is configured to generate a PPDU, where the PPDU indicates that the network device actively sends a channel information measurement result, where the PPDU further includes a mode indication field, where the mode indication field is used to indicate that the network device measures channel information. The mode of the probe PPDU used;

The sending unit 1920 is configured to send the PPDU to the target network device, where the PPDU is used by the target network device to determine a target channel information measurement result according to the mode indication field, and according to the target channel information measurement result Link adaptive adjustment.

Optionally, in this embodiment, the channel information includes a signal to noise ratio SNR of the channel;

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the embodiments are modified, or the equivalents of the technical features are replaced by the equivalents of the technical solutions of the embodiments of the present invention.

Claims

A link adaptation method for a WLAN, comprising:

Obtaining, by the first network device, a measurement result of the target channel information, where the measurement result of the target channel information is a measurement result obtained by measuring channel information of the physical layer protocol data unit PPDU of the target mode;

The first network device performs link adaptation adjustment according to the target channel information measurement result.
The link adaptation method of the WLAN according to claim 1, wherein the obtaining, by the first network device, the measurement result of the target channel information comprises:

The first network device sends a first PPDU to the second network device, where the first PPDU indicates that the second network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is a probe PPDU for instructing the second network device to generate a target mode;

The first network device receives the second PPDU sent by the second network device, where the second PPDU is a probe PPDU of the target mode generated by the second network device according to the mode indication field;

The first network device uses the second PPDU to measure channel information to obtain the target channel information measurement result.
The link adaptation method of the WLAN according to claim 1, wherein the obtaining, by the first network device, the measurement result of the target channel information comprises:

Receiving, by the first network device, a PPDU sent by the second network device, where the PPDU indicates that the second network device actively sends the channel information measurement result, where the PPDU further includes a mode indication field, where the mode indication field is used to indicate a mode in which the network device measures the PPDU used by the channel information;

The first network device determines a target channel information measurement result according to the mode indication field.
The link adaptation method of the WLAN according to any one of claims 1 to 3, wherein the mode of detecting the PPDU comprises detecting the bandwidth information of the PPDU, detecting whether the PPDU is in the indoor mode or the outdoor mode, and detecting the PPDU. At least one of Fourier variation order information of the field and guard interval information of the probe PPDU.
The link adaptation method for a WLAN according to claim 2, wherein the mode of detecting the PPDU comprises detecting whether the PPDU adopts an indoor mode or an outdoor mode;

When the mode indication field indicates that the second network device generates the probe PPDU of the outdoor mode, the second PPDU is an enhanced probe PPDU generated by the second network device according to the mode indication field;

The enhanced probe PPDU refers to a probe PPDU having at least one of the following formats:

And at least one symbol of the preamble of the probe PPDU is partially or completely replicated in a time domain or a frequency domain, and a guard interval between some or all of the symbols of the probe PPDU is greater than a first preset value, where the probe PPDU is The modulation coding mode MCS of the at least one symbol satisfies a certain preset condition, and the Fourier variation order of the at least one symbol of the sounding PPDU is higher than the second preset value.
The link adaptation method for a WLAN according to any one of claims 1 to 5, wherein the channel information includes an extended delay of a channel and/or a delay between multiple users;

Performing link adaptation adjustment by the first network device according to the measurement result of the target channel information includes:

The first network device performs adaptive adjustment of the guard interval according to the target channel information measurement result.
The link adaptation method for a WLAN according to any one of claims 1 to 5, wherein the channel information comprises a signal to noise ratio SNR of the channel;

Performing link adaptation adjustment by the first network device according to the measurement result of the target channel information includes:

The first network device performs adaptive adjustment of the modulation and coding policy MCS according to the measurement result of the target channel information.
A link adaptation method for a WLAN, comprising:

The second network device receives the first PPDU sent by the first network device, where the first PPDU indicates that the second network device needs to send the probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used by Generating a PPDU indicating that the second network device generates the target mode;

Generating, by the second network device, a probe PPDU of the target mode according to the mode indication field;

The second network device sends a second PPDU to the first network device, where the second PPDU is used by the first network device to measure channel information by using the second PPDU, to obtain the target channel information measurement. As a result, and performing link adaptive adjustment according to the target channel information measurement result whole.
The link adaptation method for a WLAN according to claim 8, wherein the mode of detecting the PPDU comprises detecting the bandwidth information of the PPDU, detecting whether the PPDU is in an indoor mode or an outdoor mode, and detecting a Fourier change of the long training field of the PPDU. At least one of the order information and the guard interval information of the probe PPDU.
The link adaptation method for a WLAN according to claim 8, wherein the mode of detecting the PPDU comprises detecting whether the PPDU adopts an indoor mode or an outdoor mode;

When the mode indication field indicates that the second network device generates the probe PPDU of the outdoor mode, the generating, by the second network device, the probe PPDU of the target mode according to the mode indication field includes:

Generating, by the second network device, an enhanced probe PPDU according to the mode indication field;

The enhanced probe PPDU refers to a probe PPDU having at least one of the following formats:

And at least one symbol of the preamble of the probe PPDU is partially or completely replicated in a time domain or a frequency domain, and a guard interval between some or all of the symbols of the probe PPDU is greater than a first preset value, where the probe PPDU is The modulation coding mode MCS of the at least one symbol satisfies a certain preset condition, and the Fourier variation order of the at least one symbol of the sounding PPDU is higher than the second preset value.
The link adaptation method for a WLAN according to any one of claims 8 to 10, wherein the channel information comprises an extended delay of a channel and/or a delay between multiple users;

The second PPDU is used by the first network device to measure an extended delay of the channel and/or a delay between multiple users using the second PPDU, and according to the measured extended delay of the channel and/or the delay between multiple users Perform adaptive adjustment of the guard interval.
The link adaptation method for a WLAN according to any one of claims 8 to 10, wherein the channel information includes an SNR of a channel;

The second PPDU is used by the first network device to measure the SNR of the channel by using the second PPDU, and performs adaptive adjustment of the MCS according to the measured SNR of the channel.
A link adaptation method for a WLAN, comprising:

The second network device generates a PPDU, where the PPDU indicates that the second network device actively sends the channel information measurement result, and the PPDU further includes a mode indication field, where the mode indication field is used to indicate that the second network device uses the channel information to measure Mode of detecting PPDUs;

The second network device sends the PPDU to the first network device, where the PPDU is used by the first network device to determine a target channel information measurement result according to the mode indication field, and according to the target channel information measurement result Link adaptive adjustment.
The link adaptation method for a WLAN according to claim 13, wherein the mode of detecting the PPDU comprises detecting bandwidth information of the PPDU, detecting whether the PPDU is in an indoor mode or an outdoor mode, and detecting a Fourier change of the long training field of the PPDU. At least one of the order information and the guard interval information of the probe PPDU.
The link adaptation method for a WLAN according to claim 13 or 14, wherein the channel information comprises an extended delay of a channel and/or a delay between multiple users;

The PPDU is used by the first network device to determine a target channel information measurement result according to the mode indication field, and perform adaptive adjustment of a guard interval according to the target channel information measurement result.
The link adaptation method for a WLAN according to claim 13 or 14, wherein the channel information comprises a signal to noise ratio SNR of the channel;

The PPDU is used by the first network device to determine a target channel information measurement result according to the mode indication field, and perform adaptive adjustment of the MCS according to the target channel information measurement result.
A network device, comprising:

An acquiring unit, configured to obtain a measurement result of the target channel information, where the measurement result of the target channel information is a measurement result obtained by measuring channel information of the physical layer protocol data unit PPDU of the target mode;

And an adjusting unit, configured to perform link adaptation adjustment according to the target channel information measurement result.
The network device according to claim 17, wherein the obtaining unit comprises:

a sending module, configured to send a first PPDU to the target network device, where the first PPDU indicates that the target network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used to indicate The target network device generates a probe PPDU of the target mode;

a first receiving module, configured to receive a second PPDU sent by the target network device, where the second PPDU is a probe PPDU of a target mode generated by the target network device according to the mode indication field;

a first acquiring module, configured to measure channel information by using the second PPDU, to obtain the target signal Road information measurement results.
The network device according to claim 17, wherein the obtaining unit comprises:

a second receiving module, configured to receive a PPDU sent by the target network device, where the PPDU indicates that the target network device actively sends the channel information measurement result, where the PPDU further includes a mode indication field, where the mode indication field is used to indicate the target network. The mode in which the device measures the channel information used by the device to detect the PPDU;

And a second acquiring module, configured to determine, according to the mode indication field, a target channel information measurement result.
The network device according to any one of claims 17 to 19, wherein the mode of detecting the PPDU comprises detecting the bandwidth information of the PPDU, detecting whether the PPDU is in the indoor mode or the outdoor mode, and detecting the long training field of the PPDU. At least one of the change order information and the guard interval information of the probe PPDU.
The network device according to claim 18, wherein the mode of detecting the PPDU comprises detecting whether the PPDU adopts an indoor mode or an outdoor mode;

When the mode indication field indicates that the target network device generates the probe PPDU of the outdoor mode, the second PPDU is an enhanced probe PPDU generated by the target network device according to the mode indication field;

The enhanced probe PPDU refers to a probe PPDU having at least one of the following formats:

And at least one symbol of the preamble of the probe PPDU is partially or completely replicated in a time domain or a frequency domain, and a guard interval between some or all of the symbols of the probe PPDU is greater than a first preset value, where the probe PPDU is The modulation coding mode MCS of the at least one symbol satisfies a certain preset condition, and the Fourier variation order of the at least one symbol of the sounding PPDU is higher than the second preset value.
The network device according to any one of claims 17 to 21, wherein the channel information comprises an extended delay of the channel and/or a delay between the plurality of users;

The adjusting unit is specifically configured to perform adaptive adjustment of a guard interval according to the target channel information measurement result.
The network device according to any one of claims 17 to 21, wherein the channel information comprises an SNR of a channel;

The adjusting unit is specifically configured to perform modulation and coding according to the measurement result of the target channel information. Slightly adaptive adjustment of the MCS.
A network device, comprising:

a receiving unit, configured to receive a first PPDU sent by the target network device, where the first PPDU indicates that the network device needs to send a probe PPDU, and the first PPDU further includes a mode indication field, where the mode indication field is used by And a probe PPDU indicating that the network device generates a target mode;

a generating unit, configured to generate a probe PPDU of the target mode according to the mode indication field;

a sending unit, configured to send a second PPDU to the target network device, where the second PPDU is used by the target network device to measure channel information by using the second PPDU, to obtain the target channel information measurement result, and Link adaptation is performed according to the target channel information measurement result.
The network device according to claim 24, wherein the mode of detecting the PPDU comprises detecting bandwidth information of the PPDU, detecting whether the PPDU is in indoor mode or outdoor mode, detecting Fourier variation order information of the long training field of the PPDU, and detecting At least one of the guard interval information of the PPDU.
The network device according to claim 24, wherein the mode of detecting the PPDU comprises detecting whether the PPDU adopts an indoor mode or an outdoor mode;

When the mode indication field indicates that the network device generates the sounding PPDU of the outdoor mode, the generating unit is specifically configured to generate an enhanced sounding PPDU according to the mode indication field;

The enhanced probe PPDU refers to a probe PPDU having at least one of the following formats:

And at least one symbol of the preamble of the probe PPDU is partially or completely replicated in a time domain or a frequency domain, and a guard interval between some or all of the symbols of the probe PPDU is greater than a first preset value, where the probe PPDU is The modulation coding mode MCS of the at least one symbol satisfies a certain preset condition, and the Fourier variation order of the at least one symbol of the sounding PPDU is higher than the second preset value.
The network device according to any one of claims 24 to 26, wherein the channel information comprises an extended delay of the channel and/or a delay between the plurality of users;

The second PPDU is used by the target network device to measure an extended delay of the channel and/or a delay between multiple users using the second PPDU, and according to the measured extended delay of the channel and/or multi-user The delay between the two is adaptively adjusted for the guard interval.
The network device according to any one of claims 24 to 26, wherein the channel information comprises an SNR of a channel;

The second PPDU is used by the target network device to measure the SNR of the channel by using the second PPDU, and performs adaptive adjustment of the MCS according to the measured SNR of the channel.
A network device, comprising:

a generating unit, configured to generate a PPDU, where the PPDU indicates that the network device actively sends a channel information measurement result, where the PPDU further includes a mode indication field, where the mode indication field is used to indicate that the network device measures channel information The mode of the probe PPDU used;

a sending unit, configured to send the PPDU to a target network device, where the PPDU is used by the target network device to determine a target channel information measurement result according to the mode indication field, and perform a chain according to the target channel information measurement result Road adaptive adjustment.
The network device according to claim 29, wherein the mode of detecting the PPDU comprises detecting bandwidth information of the PPDU, detecting whether the PPDU is in indoor mode or outdoor mode, detecting Fourier variation order information of the long training field of the PPDU, and detecting At least one of the guard interval information of the PPDU.
A network device according to claim 29 or 30, wherein said channel information comprises an extended delay of the channel and/or a delay between the plurality of users;

And the PPDU is used by the target network device to determine a target channel information measurement result according to the mode indication field, and perform adaptive adjustment of a guard interval according to the target channel information measurement result.
The network device according to claim 29 or 30, wherein the channel information comprises a signal to noise ratio SNR of the channel;

The PPDU is used by the target network device to determine a target channel information measurement result according to the mode indication field, and perform adaptive adjustment of the MCS according to the target channel information measurement result.